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import 'dart:math';
import 'dart:ui' as ui;

import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:collection/collection.dart';
import 'package:flutter/physics.dart';

main() {
  runApp(MaterialApp(

pskink

import 'dart:collection';
import 'dart:math';
import 'dart:ui' as ui;

import 'package:collection/collection.dart';
import 'package:flutter/material.dart';

// TODO
// * check if [radius] / [radii] are not too big?
// * use [Path.arcToPoint] so [radius] (and [radii]) can be specified as [Radius]

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/*
class FooPerspective extends StatefulWidget {
  @override
  State<FooPerspective> createState() => _FooPerspectiveState();
}

class _FooPerspectiveState extends State<FooPerspective> with TickerProviderStateMixin {
  static const src = [
    Offset(0, 0),
    Offset(100, 0),

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/*
class ValueNotifierAnimationTest extends StatefulWidget {
  @override
  State<ValueNotifierAnimationTest> createState() => _ValueNotifierAnimationTestState();
}

class _ValueNotifierAnimationTestState extends State<ValueNotifierAnimationTest> {
  late ValueNotifierAnimation<double> _animation;
  late ValueNotifierAnimation<double> _opacity;
  late Animation<double> _mean;

pskink

import 'dart:math';
import 'dart:ui' show lerpDouble;
import 'dart:ui' as ui;

import 'package:flutter/foundation.dart';
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';

/// Functional equivalent of [RSTransform] in [Matrix4] world,

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import 'dart:ui';
import 'dart:math';

import 'package:flutter/material.dart';

/*
class CornerDecorationTest extends StatefulWidget {
  @override
  _CornerDecorationTestState createState() => _CornerDecorationTestState();
}

pskink

import 'dart:async';
import 'dart:math';
import 'dart:ui' as ui;

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

// provides:
//   1. DecorationStack

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import 'dart:ui' as ui;
import 'dart:math';

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';

/// A custom [Scrollable] with a fixed content.
///
/// Can be used with:
///  1. static content animated with given [ViewportOffset]

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/*
// sample usage: 

child: ColorFilteredPageView(
  image: NetworkImage('https://unsplash.com/photos/3fEzry0pIms/download?force=true&w=640'),
  filters: myFilters,
  filterNames: myFilterNames,
),
*/

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import 'package:flutter/widgets.dart';

/*
// first example
//
// the most important parts of the code is:
//
// ❶ - super(relayout: _animationController) it means that performLayout() method
//      will be called whenever _animationController notifies its listeners
// ❷ - layoutChild() where each child is sized with its "default" size